Android build doesn't fail when adb missing from path

[diablozzq]

Problem

The dx serve --platform android doesn't check for adb in path before trying to launch. If it's missing, it will Build complete successfully and not launch.

Steps To Reproduce

Remove $HOME/Library/Android/sdk/platform-tools from path i.e. adb. Then run dx serve --platform android with an Android emulator started. The app will build but not launch and not inform the user.

Expected behavior

An error should occur if adb is not found.

Environment:

• Dioxus version: .6.0.1
• Rust version: latest
• OS info: Mac OSX
• App platform: android